<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * CodeIgniter Date Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/date_helper.html
 */
// ------------------------------------------------------------------------

/**
 * Get "now" time
 *
 * Returns time() or its GMT equivalent based on the config file preference
 *
 * @access	public
 * @return	integer
 */
if (!function_exists('now')) {

    function now() {
        $CI = & get_instance();

        if (strtolower($CI->config->item('time_reference')) == 'gmt') {
            $now = time();
            $system_time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));

            if (strlen($system_time) < 10) {
                $system_time = time();
                log_message('error', 'The Date class could not set a proper GMT timestamp so the local time() value was used.');
            }

            return $system_time;
        } else {
            return time();
        }
    }

}

// ------------------------------------------------------------------------

/**
 * Convert MySQL Style Datecodes
 *
 * This function is identical to PHPs date() function,
 * except that it allows date codes to be formatted using
 * the MySQL style, where each code letter is preceded
 * with a percent sign:  %Y %m %d etc...
 *
 * The benefit of doing dates this way is that you don't
 * have to worry about escaping your text letters that
 * match the date codes.
 *
 * @access	public
 * @param	string
 * @param	integer
 * @return	integer
 */
if (!function_exists('mdate')) {

    function mdate($datestr = '', $time = '') {
        if ($datestr == '')
            return '';

        if ($time == '')
            $time = now();

        $datestr = str_replace('%\\', '', preg_replace("/([a-z]+?){1}/i", "\\\\\\1", $datestr));
        return date($datestr, $time);
    }

}

// ------------------------------------------------------------------------

/**
 * Standard Date
 *
 * Returns a date formatted according to the submitted standard.
 *
 * @access	public
 * @param	string	the chosen format
 * @param	integer	Unix timestamp
 * @return	string
 */
if (!function_exists('standard_date')) {

    function standard_date($fmt = 'DATE_RFC822', $time = '') {
        $formats = array(
            'DATE_ATOM' => '%Y-%m-%dT%H:%i:%s%Q',
            'DATE_COOKIE' => '%l, %d-%M-%y %H:%i:%s UTC',
            'DATE_ISO8601' => '%Y-%m-%dT%H:%i:%s%Q',
            'DATE_RFC822' => '%D, %d %M %y %H:%i:%s %O',
            'DATE_RFC850' => '%l, %d-%M-%y %H:%i:%s UTC',
            'DATE_RFC1036' => '%D, %d %M %y %H:%i:%s %O',
            'DATE_RFC1123' => '%D, %d %M %Y %H:%i:%s %O',
            'DATE_RSS' => '%D, %d %M %Y %H:%i:%s %O',
            'DATE_W3C' => '%Y-%m-%dT%H:%i:%s%Q'
        );

        if (!isset($formats[$fmt])) {
            return FALSE;
        }

        return mdate($formats[$fmt], $time);
    }

}

// ------------------------------------------------------------------------

/**
 * Timespan
 *
 * Returns a span of seconds in this format:
 * 	10 days 14 hours 36 minutes 47 seconds
 *
 * @access	public
 * @param	integer	a number of seconds
 * @param	integer	Unix timestamp
 * @return	integer
 */
if (!function_exists('timespan')) {

    function timespan($seconds = 1, $time = '') {
        $CI = & get_instance();
        $CI->lang->load('date');

        if (!is_numeric($seconds)) {
            $seconds = 1;
        }

        if (!is_numeric($time)) {
            $time = time();
        }

        if ($time <= $seconds) {
            $seconds = 1;
        } else {
            $seconds = $time - $seconds;
        }

        $str = '';
        $years = floor($seconds / 31536000);

        if ($years > 0) {
            $str .= $years . ' ' . $CI->lang->line((($years > 1) ? 'date_years' : 'date_year')) . ', ';
        }

        $seconds -= $years * 31536000;
        $months = floor($seconds / 2628000);

        if ($years > 0 OR $months > 0) {
            if ($months > 0) {
                $str .= $months . ' ' . $CI->lang->line((($months > 1) ? 'date_months' : 'date_month')) . ', ';
            }

            $seconds -= $months * 2628000;
        }

        $weeks = floor($seconds / 604800);

        if ($years > 0 OR $months > 0 OR $weeks > 0) {
            if ($weeks > 0) {
                $str .= $weeks . ' ' . $CI->lang->line((($weeks > 1) ? 'date_weeks' : 'date_week')) . ', ';
            }

            $seconds -= $weeks * 604800;
        }

        $days = floor($seconds / 86400);

        if ($months > 0 OR $weeks > 0 OR $days > 0) {
            if ($days > 0) {
                $str .= $days . ' ' . $CI->lang->line((($days > 1) ? 'date_days' : 'date_day')) . ', ';
            }

            $seconds -= $days * 86400;
        }

        $hours = floor($seconds / 3600);

        if ($days > 0 OR $hours > 0) {
            if ($hours > 0) {
                $str .= $hours . ' ' . $CI->lang->line((($hours > 1) ? 'date_hours' : 'date_hour')) . ', ';
            }

            $seconds -= $hours * 3600;
        }

        $minutes = floor($seconds / 60);

        if ($days > 0 OR $hours > 0 OR $minutes > 0) {
            if ($minutes > 0) {
                $str .= $minutes . ' ' . $CI->lang->line((($minutes > 1) ? 'date_minutes' : 'date_minute')) . ', ';
            }

            $seconds -= $minutes * 60;
        }

        if ($str == '') {
            $str .= $seconds . ' ' . $CI->lang->line((($seconds > 1) ? 'date_seconds' : 'date_second')) . ', ';
        }

        return substr(trim($str), 0, -1);
    }

}

// ------------------------------------------------------------------------

/**
 * Number of days in a month
 *
 * Takes a month/year as input and returns the number of days
 * for the given month/year. Takes leap years into consideration.
 *
 * @access	public
 * @param	integer a numeric month
 * @param	integer	a numeric year
 * @return	integer
 */
if (!function_exists('days_in_month')) {

    function days_in_month($month = 0, $year = '') {
        if ($month < 1 OR $month > 12) {
            return 0;
        }

        if (!is_numeric($year) OR strlen($year) != 4) {
            $year = date('Y');
        }

        if ($month == 2) {
            if ($year % 400 == 0 OR ($year % 4 == 0 AND $year % 100 != 0)) {
                return 29;
            }
        }

        $days_in_month = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
        return $days_in_month[$month - 1];
    }

}

// ------------------------------------------------------------------------

/**
 * Converts a local Unix timestamp to GMT
 *
 * @access	public
 * @param	integer Unix timestamp
 * @return	integer
 */
if (!function_exists('local_to_gmt')) {

    function local_to_gmt($time = '') {
        if ($time == '')
            $time = time();

        return mktime(gmdate("H", $time), gmdate("i", $time), gmdate("s", $time), gmdate("m", $time), gmdate("d", $time), gmdate("Y", $time));
    }

}

// ------------------------------------------------------------------------

/**
 * Converts GMT time to a localized value
 *
 * Takes a Unix timestamp (in GMT) as input, and returns
 * at the local value based on the timezone and DST setting
 * submitted
 *
 * @access	public
 * @param	integer Unix timestamp
 * @param	string	timezone
 * @param	bool	whether DST is active
 * @return	integer
 */
if (!function_exists('gmt_to_local')) {

    function gmt_to_local($time = '', $timezone = 'UTC', $dst = FALSE) {
        if ($time == '') {
            return now();
        }

        $time += timezones($timezone) * 3600;

        if ($dst == TRUE) {
            $time += 3600;
        }

        return $time;
    }

}

// ------------------------------------------------------------------------

/**
 * Converts a MySQL Timestamp to Unix
 *
 * @access	public
 * @param	integer Unix timestamp
 * @return	integer
 */
if (!function_exists('mysql_to_unix')) {

    function mysql_to_unix($time = '') {
        // We'll remove certain characters for backward compatibility
        // since the formatting changed with MySQL 4.1
        // YYYY-MM-DD HH:MM:SS

        $time = str_replace('-', '', $time);
        $time = str_replace(':', '', $time);
        $time = str_replace(' ', '', $time);

        // YYYYMMDDHHMMSS
        return mktime(
                        substr($time, 8, 2), substr($time, 10, 2), substr($time, 12, 2), substr($time, 4, 2), substr($time, 6, 2), substr($time, 0, 4)
        );
    }

}

// ------------------------------------------------------------------------

/**
 * Unix to "Human"
 *
 * Formats Unix timestamp to the following prototype: 2006-08-21 11:35 PM
 *
 * @access	public
 * @param	integer Unix timestamp
 * @param	bool	whether to show seconds
 * @param	string	format: us or euro
 * @return	string
 */
if (!function_exists('unix_to_human')) {

    function unix_to_human($time = '', $seconds = FALSE, $fmt = 'us') {
        $r = date('Y', $time) . '-' . date('m', $time) . '-' . date('d', $time) . ' ';

        if ($fmt == 'us') {
            $r .= date('h', $time) . ':' . date('i', $time);
        } else {
            $r .= date('H', $time) . ':' . date('i', $time);
        }

        if ($seconds) {
            $r .= ':' . date('s', $time);
        }

        if ($fmt == 'us') {
            $r .= ' ' . date('A', $time);
        }

        return $r;
    }

}

// ------------------------------------------------------------------------

/**
 * Convert "human" date to GMT
 *
 * Reverses the above process
 *
 * @access	public
 * @param	string	format: us or euro
 * @return	integer
 */
if (!function_exists('human_to_unix')) {

    function human_to_unix($datestr = '') {
        if ($datestr == '') {
            return FALSE;
        }

        $datestr = trim($datestr);
        $datestr = preg_replace("/\040+/", ' ', $datestr);

        if (!preg_match('/^[0-9]{2,4}\-[0-9]{1,2}\-[0-9]{1,2}\s[0-9]{1,2}:[0-9]{1,2}(?::[0-9]{1,2})?(?:\s[AP]M)?$/i', $datestr)) {
            return FALSE;
        }

        $split = explode(' ', $datestr);

        $ex = explode("-", $split['0']);

        $year = (strlen($ex['0']) == 2) ? '20' . $ex['0'] : $ex['0'];
        $month = (strlen($ex['1']) == 1) ? '0' . $ex['1'] : $ex['1'];
        $day = (strlen($ex['2']) == 1) ? '0' . $ex['2'] : $ex['2'];

        $ex = explode(":", $split['1']);

        $hour = (strlen($ex['0']) == 1) ? '0' . $ex['0'] : $ex['0'];
        $min = (strlen($ex['1']) == 1) ? '0' . $ex['1'] : $ex['1'];

        if (isset($ex['2']) && preg_match('/[0-9]{1,2}/', $ex['2'])) {
            $sec = (strlen($ex['2']) == 1) ? '0' . $ex['2'] : $ex['2'];
        } else {
            // Unless specified, seconds get set to zero.
            $sec = '00';
        }

        if (isset($split['2'])) {
            $ampm = strtolower($split['2']);

            if (substr($ampm, 0, 1) == 'p' AND $hour < 12)
                $hour = $hour + 12;

            if (substr($ampm, 0, 1) == 'a' AND $hour == 12)
                $hour = '00';

            if (strlen($hour) == 1)
                $hour = '0' . $hour;
        }

        return mktime($hour, $min, $sec, $month, $day, $year);
    }

}

// ------------------------------------------------------------------------

/**
 * Timezone Menu
 *
 * Generates a drop-down menu of timezones.
 *
 * @access	public
 * @param	string	timezone
 * @param	string	classname
 * @param	string	menu name
 * @return	string
 */
if (!function_exists('timezone_menu')) {

    function timezone_menu($default = 'UTC', $class = "", $name = 'timezones') {
        $CI = & get_instance();
        $CI->lang->load('date');

        if ($default == 'GMT')
            $default = 'UTC';

        $menu = '<select name="' . $name . '"';

        if ($class != '') {
            $menu .= ' class="' . $class . '"';
        }

        $menu .= ">\n";

        foreach (timezones() as $key => $val) {
            $selected = ($default == $key) ? " selected='selected'" : '';
            $menu .= "<option value='{$key}'{$selected}>" . $CI->lang->line($key) . "</option>\n";
        }

        $menu .= "</select>";

        return $menu;
    }

}

// ------------------------------------------------------------------------

/**
 * Timezones
 *
 * Returns an array of timezones.  This is a helper function
 * for various other ones in this library
 *
 * @access	public
 * @param	string	timezone
 * @return	string
 */
if (!function_exists('timezones')) {

    function timezones($tz = '') {
        // Note: Don't change the order of these even though
        // some items appear to be in the wrong order

        $zones = array(
            'UM12' => -12,
            'UM11' => -11,
            'UM10' => -10,
            'UM95' => -9.5,
            'UM9' => -9,
            'UM8' => -8,
            'UM7' => -7,
            'UM6' => -6,
            'UM5' => -5,
            'UM45' => -4.5,
            'UM4' => -4,
            'UM35' => -3.5,
            'UM3' => -3,
            'UM2' => -2,
            'UM1' => -1,
            'UTC' => 0,
            'UP1' => +1,
            'UP2' => +2,
            'UP3' => +3,
            'UP35' => +3.5,
            'UP4' => +4,
            'UP45' => +4.5,
            'UP5' => +5,
            'UP55' => +5.5,
            'UP575' => +5.75,
            'UP6' => +6,
            'UP65' => +6.5,
            'UP7' => +7,
            'UP8' => +8,
            'UP875' => +8.75,
            'UP9' => +9,
            'UP95' => +9.5,
            'UP10' => +10,
            'UP105' => +10.5,
            'UP11' => +11,
            'UP115' => +11.5,
            'UP12' => +12,
            'UP1275' => +12.75,
            'UP13' => +13,
            'UP14' => +14
        );

        if ($tz == '') {
            return $zones;
        }

        if ($tz == 'GMT')
            $tz = 'UTC';

        return (!isset($zones[$tz])) ? 0 : $zones[$tz];
    }

}


/* End of file date_helper.php */
/* Location: ./system/helpers/date_helper.php */